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CVE-2026-71958— D-Link DWR-M961 Buffer Overflow via quicksetup.cgi

Quick assessment

Affected
D-Link Corporation DWR-M961
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

D-Link DWR-M961是中国D-Link公司的一款便携式无线路由器。 D-Link DWR-M961 1.1.2_C1_202602110044版本存在缓冲区错误漏洞，该漏洞源于quicksetup.cgi接口存在缓冲区溢出，远程攻击者可通过向test4、ssid2和username字段写入超长字符串并构造特定payload执行任意命令，或导致设备崩溃。

CVSS 9.8 · Critical EPSS 1.07% · P64

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
D-Link Corporation DWR-M961 < 1.1.5_C1_202607071108 affected
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I. Basic Information for CVE-2026-71958

Vulnerability Information
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Vulnerability Title
D-Link DWR-M961 Buffer Overflow via quicksetup.cgi
Source: CVE Program / CVE List V5
Vulnerability Description
D-Link DWR-M961 devices with hardware version C1 and software version 1.1.2_C1_202602110044 contain a buffer overflow vulnerability in the quicksetup.cgi interface. A remote attacker can write overly long strings to the test4, ssid2, and username fields and execute arbitrary commands by crafting a specific payload, or cause the device to crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
D-Link DWR-M961 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DWR-M961是中国D-Link公司的一款便携式无线路由器。 D-Link DWR-M961 1.1.2_C1_202602110044版本存在缓冲区错误漏洞，该漏洞源于quicksetup.cgi接口存在缓冲区溢出，远程攻击者可通过向test4、ssid2和username字段写入超长字符串并构造特定payload执行任意命令，或导致设备崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
D-Link Corporation DWR-M961 0 ~ 1.1.5_C1_202607071108 -

II. Public POCs for CVE-2026-71958

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III. Intelligence Information for CVE-2026-71958

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Vendor Advisories for CVE-2026-71958 (2)

Other References for CVE-2026-71958 (1)

Same Patch Batch · D-Link Corporation · 2026-08-08 · 15 CVEs total

CVE-2026-71954 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formL2tpv3ConfigSetup
CVE-2026-71950 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formSmsManage
CVE-2026-71952 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formPinManageSetup
CVE-2026-71948 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formDebugDiagnosticRun
CVE-2026-71946 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formPingDiagnosticRun
CVE-2026-71955 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formWsc
CVE-2026-71945 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formLtefotaUpgradeFibocom
CVE-2026-71951 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formIMEISetup
CVE-2026-71949 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formUSSDSetup
CVE-2026-71953 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formNtp
CVE-2026-71947 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formTracerouteDiagnosticRun
CVE-2026-71944 9.8 CRITICAL D-Link DWR-M961 Command Injection via /boafrm/formLtefotaUpgradeQuectel
CVE-2026-71957 9.8 CRITICAL D-Link DWR-M961 Buffer Overflow via app.cgi
CVE-2026-71956 9.8 CRITICAL D-Link DWR-M961 Command Injection via app.cgi

IV. Related Vulnerabilities

Same product: DWR-M961
Same vendor: D-Link Corporation
Same weakness: CWE-120

V. Comments for CVE-2026-71958

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